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Author Title Year Publication Serial (down) Volume Pages
DiGian, K.A.; Friedrich, A.M.; Zentall, T.R. Discriminative stimuli that follow a delay have added value for pigeons 2004 Psychonomic bulletin & review 226 11 889-895
Herrmann, E.; Melis, A.P.; Tomasello, M. Apes' use of iconic cues in the object-choice task 2006 Animal cognition 14 9 118-130